The Combined Risk Index is calculated by normalizing the values of the following columns:
Each column is normalized to a range between 0 and 1, where 0 represents the lowest risk and 1 represents the highest risk. The Combined Risk Index is the average of these normalized values.
Note that for the normalization:
In the Pacific context, these variables are crucial due to their direct impact on communities' vulnerability to natural disasters, accessibility, and overall resilience:
High risk sites are classified as follows:
The percentage of high-risk sites is calculated as the number of high-risk sites divided by the total number of sites.
| State | Mean Rainfall in Driest Quarter (mm) | Median Rainfall in Driest Quarter (mm) | Std Dev Rainfall in Driest Quarter (mm) | Mean Height above Sea Level (m) | Median Height above Sea Level (m) | Std Dev Height above Sea Level (m) | Mean Height above Drainage Network (m) | Median Height above Drainage Network (m) | Std Dev Height above Drainage Network (m) | High Risk Sites (Rainfall) | High Risk Sites (Height above Sea Level) | High Risk Sites (Height above Drainage Network) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chuuk | 303 | 0 | 320 | 8 | 4 | 21 | 8 | 4 | 21 | 71 (97.0%) | 53 (73.0%) | 54 (74.0%) |
| Nanumanga | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 (100.0%) | 1 (100.0%) | 1 (100.0%) |
| None | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Kosrae | 1142 | 1142 | 2 | 6 | 5 | 4 | 3 | 1 | 4 | 0 (0.0%) | 8 (89.0%) | 8 (89.0%) |
| Pohnpei | 782 | 922 | 338 | 38 | 26 | 43 | 14 | 8 | 14 | 7 (18.0%) | 9 (22.0%) | 21 (52.0%) |
| Yap | 220 | 218 | 222 | 18 | 14 | 16 | 15 | 12 | 12 | 42 (100.0%) | 15 (36.0%) | 15 (36.0%) |
| National | 402 | 440 | 402 | 16 | 7 | 28 | 10 | 5 | 17 | 140 (76.0%) | 104 (57.0%) | 117 (64.0%) |
Very High Risk (0.8 - 1.0)
High Risk (0.6 - 0.8)
Moderate Risk (0.4 - 0.6)
Low Risk (0.2 - 0.4)
Very Low Risk (0 - 0.2)
| Parameter | Mean | Median | Std Dev | High Risk Sites |
|---|---|---|---|---|
| Rainfall in driest quarter | 402 | 440 | 402 | 140 (76.0%) |
| Height above sea level | 16 | 7 | 28 | 104 (57.0%) |
| Height above drainage network | 10 | 5 | 17 | 117 (64.0%) |
| Parameter | Mean | Median | Std Dev | High Risk Sites |
|---|---|---|---|---|
| Rainfall in driest quarter | 303 | 0 | 320 | 71 (97.0%) |
| Height above sea level | 8 | 4 | 21 | 53 (73.0%) |
| Height above drainage network | 8 | 4 | 21 | 54 (74.0%) |
| Parameter | Mean | Median | Std Dev | High Risk Sites |
|---|---|---|---|---|
| Rainfall in driest quarter | 0 | 0 | 0 | 1 (100.0%) |
| Height above sea level | 0 | 0 | 0 | 1 (100.0%) |
| Height above drainage network | 0 | 0 | 0 | 1 (100.0%) |
| Parameter | Mean | Median | Std Dev | High Risk Sites |
|---|---|---|---|---|
| Rainfall in driest quarter | 0 | 0 | 0 | 0 |
| Height above sea level | 0 | 0 | 0 | 0 |
| Height above drainage network | 0 | 0 | 0 | 0 |
| Parameter | Mean | Median | Std Dev | High Risk Sites |
|---|---|---|---|---|
| Rainfall in driest quarter | 1142 | 1142 | 2 | 0 (0.0%) |
| Height above sea level | 6 | 5 | 4 | 8 (89.0%) |
| Height above drainage network | 3 | 1 | 4 | 8 (89.0%) |
| Parameter | Mean | Median | Std Dev | High Risk Sites |
|---|---|---|---|---|
| Rainfall in driest quarter | 782 | 922 | 338 | 7 (18.0%) |
| Height above sea level | 38 | 26 | 43 | 9 (22.0%) |
| Height above drainage network | 14 | 8 | 14 | 21 (52.0%) |
| Parameter | Mean | Median | Std Dev | High Risk Sites |
|---|---|---|---|---|
| Rainfall in driest quarter | 220 | 218 | 222 | 42 (100.0%) |
| Height above sea level | 18 | 14 | 16 | 15 (36.0%) |
| Height above drainage network | 15 | 12 | 12 | 15 (36.0%) |
Rainfall in driest quarter: Data sourced from WORLDCLIM, calculated using precipitation of the driest quarter.
Height above sea level: Data sourced from MERIT Hydro DEM, calculated using elevation values. The height above sea level (HASL) provides information about the elevation of a location relative to mean sea level. It's a critical factor for assessing flood and storm surge risks. Lower HASL indicates higher vulnerability. HASL's advantage is its direct relation to flood risks from sea level rise and storm surges. However, it does not account for local topography and drainage patterns which can affect flood risks.
Height above drainage network: Data sourced from MERIT Hydro DEM, calculated using height above nearest drainage (HAND). The height above drainage network (HAND) provides a measure of the elevation of a location relative to the nearest drainage point. It is essential for understanding flood risks from rainfall events. Lower HAND values indicate higher flood risk. HAND's advantage is its ability to account for local topography and drainage patterns. However, it does not directly relate to risks from sea level rise or storm surges.